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POReducing legend size in ggplot beyond default size
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copied!<p>My goal is to make several plots with <code>ggplot</code> and combine them into a single plot using <code>grid.arrange</code> in the <code>gridExtra</code> package.</p> <p>I'm having an issue in that the legends in my <code>ggplot</code> (while appropriately sized for a single plot) are too large when I try to place the plots side by side with <code>grid.arrange</code>. The resulting combined plots reduce the x-axis but keep the legend original size. So the result is a very skinny plot, next to an needlessly large legend. So I'd like to reduce the size of the legend in each plot, enough so that I can place my plots side by side. Or possible shrink them enough to bring them inside the actual plot without being to overbearing.</p> <pre><code>V1<-rnorm(10) V2<-rnorm(10) V3<-rnorm(10) DF<-data.frame(V1,V2,V3) ggplot(DF,aes(x=V1,y=V2,size=V3))+ geom_point(fill='red',shape=21)+ theme_bw()+ scale_size(range=c(5,20)) </code></pre> <p>This plot command produces a standard legend size to the right of the plot.</p> <p><img src="https://i.stack.imgur.com/HKK2M.jpg" alt="enter image description here"></p> <p>I've tried using different theme elements:</p> <pre><code>+theme(legend.key.size = unit(0.5, "cm") </code></pre> <p>or</p> <pre><code>+theme(legend.key.width=unit(0.3,"cm"),legend.key.height=unit(0.3,"cm"),legend.position = c(0.7, 0.8)) </code></pre> <p>And while I can make the legend larger using these theme commands, I can't make the legend any smaller than the default legend. So is there any way to shrink the legend beyond the default size?</p> <p>I can also change the default size of my pdf device to make it wider and accommodate the large legends , but I'd like to work with a standard pdf size for now. </p>

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